Power-Domain NOMA for Continuous DOCSIS Bandwidth Requests
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Solution Overview
Problem
Conventional Orthogonal Multiple Access (OMA) schemes face challenges in managing uplink and downlink bandwidth requests, leading to inefficiencies due to designated contention windows that reduce data transmission capacity and increase the likelihood of collisions among devices.
Innovation Solution
Implementing Power Domain Non-Orthogonal Multiple Access (PD-NOMA) to embed bandwidth requests within data payloads at different power levels, eliminating the need for separate contention windows and reducing collision likelihood through interference cancellation techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If designated contention windows are used for bandwidth requests, then bandwidth request management is simplified, but data transmission capacity is reduced and collision likelihood increases
Solution Approach 1:
The patent combines bandwidth requests and data payloads into the same transmission resource blocks, eliminating separate contention windows. Devices transmit both bandwidth requests and data in overlapping time-frequency resources, with bandwidth requests transmitted at lower power levels. This merging approach removes the need for dedicated request timeslots, thereby increasing data transmission capacity while maintaining request management functionality through power-level differentiation and successive interference cancellation at the receiver.
2Ease of operation
If separate contention windows are used for bandwidth requests, then request transmission is organized, but time resources are wasted during timeslots when data transmissions could otherwise be performed
Solution Approach 1:
The patent merges bandwidth request transmission with data transmission by allowing both to occur simultaneously in the same resource blocks. Bandwidth requests are transmitted at lower power levels during the same timeslots when data payloads are transmitted at higher power levels, eliminating the need for separate contention windows and preventing loss of data transmission time.
Solution Approach 2:
The patent enables continuous data transmission without interruption for separate request windows. By embedding bandwidth requests within data transmission timeslots using power domain differentiation, the system maintains continuous useful action in the form of data transmission, eliminating idle timeslots that would otherwise be dedicated solely to bandwidth requests.
3Productivity
If multiple devices transmit bandwidth requests during designated contention windows, then bandwidth requests are made simultaneously, but collisions occur between requests from different devices
Solution Approach 1:
The patent applies local quality differentiation by assigning different power levels to bandwidth requests based on their local transmission conditions and device characteristics. Each device transmits bandwidth requests at a power level adapted to its specific channel conditions, and the receiver uses successive interference cancellation to reliably decode requests from multiple devices even when transmitted simultaneously, thereby maintaining both efficiency and reliability.
Solution Approach 2:
The patent changes the power level parameter to differentiate bandwidth requests from data payloads and to enable reliable reception of simultaneous requests from multiple devices. By transmitting requests at lower power levels than data payloads, and using successive interference cancellation to separate signals based on power level differences, the system resolves collisions that would occur in conventional simultaneous transmission schemes.
4Device complexity
If bandwidth requests are transmitted at the same power level as data payloads, then transmission simplicity is maintained, but request detection becomes difficult amidst stronger data signals
Solution Approach 1:
The patent applies local quality differentiation by assigning different power levels to bandwidth requests and data payloads. Bandwidth requests are transmitted at lower power levels specifically optimized for their detection needs, while data payloads use higher power levels for their throughput requirements. The receiver uses successive interference cancellation to first decode the lower power request signals and then subtract them to decode the higher power data signals, making request detection feasible without excessive transmission complexity.
Data Source
AI summary
The present disclosure relates to multi-MAC controller and single PHY systems and methods. An example method may include transmitting, via a first device in a Data Over Cable Service Interface Specification (DOCSIS) network, a first block of data within a first time slot and at a first power level. The example method may also include transmitting, via a second device in the DOCSIS network, a second block of data within the first time slot and at a second power level, the second power level being based on an attenuation of the first network tap device associated with the first device, wherein the first power level is different from the second power level.